The short version of glutathione fits in a sentence. The long version — which is the one that helps — is below.
This page was last updated on 2025-08-09 and is reviewed periodically as new material appears.
Glutathione functions in redox balance, detoxification, and sulfur amino acid storage. It participates in reactions that help maintain ascorbate and protein thiol status. The molecule serves as a cofactor for several enzymes, including glutathione peroxidases and glutathione S-transferases. These enzymes reduce peroxides and conjugate electrophiles, respectively. Glutathione also contributes to the metabolism of xenobiotics and to the transport of cysteine between tissues. How interorgan transport and tissue-specific regulation shape whole-body pools remains an active area of study.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. Its cysteine residue carries a thiol group, which allows the molecule to participate in reduction and oxidation reactions. The compound exists in most living cells, where the reduced form, often abbreviated GSH, is usually more abundant than the oxidized disulfide form, GSSG. Intracellular concentrations are commonly in the millimolar range, while extracellular concentrations are much lower. This uneven distribution supports its role as a major cellular redox buffer.
Samples for glutathione analysis require careful handling because the compound oxidizes readily and can be consumed by enzymes after collection. Blood is often treated with acid or thiol-blocking agents soon after draw, and plasma should be separated quickly from red blood cells. Tissues are usually snap-frozen or extracted immediately. Aqueous solutions of glutathione are less stable than dry powder and degrade faster at neutral or alkaline pH, in light, or with dissolved oxygen. Repeated freeze-thaw cycles also reduce reliability.
Quality control for glutathione materials checks identity, assay, purity, water content, and disulfide content. Commercial products vary from research-grade powder to dietary supplements, and labels may not distinguish reduced from oxidized forms. In the United States, oral glutathione is commonly sold as a dietary supplement rather than an approved drug, while injectable forms fall under different rules and may require a prescription. Regulatory status differs by country. Analytical certificates, when available, help verify what a material contains, but independent testing remains important for interpretation.
Laboratory measurement of glutathione typically starts with rapid acid extraction to prevent oxidation and enzymatic degradation. Common methods include enzymatic recycling assays, high-performance liquid chromatography, and liquid chromatography coupled with mass spectrometry. The recycling assay uses glutathione reductase and a thiol-reactive colorimetric or fluorescent reagent, measuring total glutathione after converting disulfide forms. Chromatographic methods can separate reduced and oxidized forms, which helps when the redox ratio is the target. Choice of method affects sensitivity, specificity, and the amount of sample needed.
| Property | Value | Notes |
|---|---|---|
| Chemical formula | C10H17N3O6S | Reduced glutathione (GSH) |
| Molar mass | 307.32 g/mol | Calculated for C10H17N3O6S |
| Appearance | White to off-white powder | Typical solid form |
| Solubility | Water-soluble | Polar tripeptide |
| Common synonyms | GSH; L-glutathione | Gamma-glutamylcysteinylglycine |
Synthesis occurs in two ATP-dependent steps. The enzyme glutamate-cysteine ligase joins glutamate and cysteine to form gamma-glutamylcysteine, and glutathione synthetase adds glycine. The first step is rate-limiting and is influenced by cysteine availability and feedback inhibition by GSH. Breakdown involves gamma-glutamyl transferase and subsequent peptidases, which release constituent amino acids for reuse. Because turnover differs among tissues, measurements from blood, plasma, and tissues are not directly interchangeable. Research continues to clarify how compartment-specific pools are regulated in health and disease.
Glutathione is a tripeptide composed of glutamate, cysteine, and glycine. It contains an unusual gamma-glutamyl bond between glutamate and cysteine, which resists cleavage by many peptidases. The reduced form, GSH, carries a thiol group on cysteine and is the dominant intracellular form in most cells. Its structure allows it to participate in redox reactions and to serve as a sulfur donor. The oxidized form, GSSG, consists of two GSH molecules joined by a disulfide bond.
Commercial glutathione is produced by microbial fermentation or chemical synthesis, then purified. Reduced and oxidized grades are offered separately, with purity specifications often exceeding 98 percent. The compound appears in foods such as fresh fruits, vegetables, and meats, although cooking and processing can lower amounts. Oral, topical, and inhaled forms are discussed in research and consumer contexts, but absorption and tissue delivery remain active areas of study. Regulatory status varies by country and intended use.
Glutathione is a small sulfur-containing peptide built from glutamic acid, cysteine, and glycine. Its distinctive feature is a gamma-glutamyl bond between glutamate's side-chain carboxyl group and cysteine's amino group. This linkage resists ordinary peptidases and helps the molecule remain stable inside cells. The reduced thiol form, often abbreviated GSH, is the dominant intracellular species. The oxidized disulfide dimer, GSSG, forms when two reduced molecules link through their cysteine sulfur atoms. The balance between these forms is a common redox indicator.
Glutathione supports several cellular processes beyond direct antioxidant action. It serves as a cofactor for glutathione peroxidase and glutathione S-transferase enzymes, which reduce peroxides and conjugate electrophiles, respectively. The molecule also acts as a reservoir of cysteine, an amino acid that can limit protein synthesis and redox signaling. In human nutrition, oral glutathione is sold as a supplement, but how much intact glutathione reaches tissues after ingestion remains an active research question. Clinical claims about supplementation are not uniformly supported by controlled trials.
Glutathione is a small tripeptide built from glutamic acid, cysteine, and glycine. Its peptide bond between glutamate and cysteine involves the gamma-carboxyl group rather than the usual alpha-carboxyl group. This structure gives the molecule a reactive thiol on the cysteine residue. The reduced form, often abbreviated GSH, is the predominant intracellular species in many cell types. Because the thiol can donate electrons, glutathione participates in redox chemistry and in the conjugation of reactive molecules.
Cells synthesize glutathione through two ATP-dependent steps: glutamate-cysteine ligase joins glutamate and cysteine, and glutathione synthetase adds glycine to form the complete tripeptide. Breakdown occurs through gamma-glutamyl transpeptidase and subsequent peptidase reactions, forming the gamma-glutamyl cycle. Within cells, glutathione also forms a disulfide-linked dimer called GSSG when two GSH molecules react. The balance between GSH and GSSG is widely used as an indicator of oxidative conditions, although the ratio can vary by compartment and tissue.
In September 2000, up to $50 million worth of Taco Bell-branded shells were recalled from supermarkets. The shells contained a variety of genetically modified corn called StarLink that was not approved for human consumption. StarLink was approved only for use in animal feed because of questions about whether it can cause allergic reactions in people. It was the first-ever recall of genetically modified food (GMO). Corn was not segregated at grain elevators and the miller in Texas did not order that type. In 2001, Tricon Global announced a $60 million settlement with the suppliers. They stated that it would go to Taco Bell franchisees and TGR would not take any of it.
== Medical significance == Pathogenic (homozygous and compound heterozygous) mutations in TARS1 are associated with trichothiodystrophy (a type of hair fragility disorder), with the type caused by TARS1 mutation designated as: nonphotosensitive trichothiodystrophy-7 (TTD7).
Protein microarrays and high throughput (HT) mass spectrometry (MS) can provide a snapshot of the proteins present in a biological sample. The former approach faces similar problems as with microarrays targeted at mRNA, the latter involves the problem of matching large amounts of mass data against predicted masses from protein sequence databases, and the complicated statistical analysis of samples when multiple incomplete peptides from each protein are detected. Cellular protein localization in a tissue context can be achieved through affinity proteomics displayed as spatial data based on immunohistochemistry and tissue microarrays.
=== Bone scan === The nuclear medicine technique commonly called the bone scan usually uses 99mTc. It is not to be confused with the "bone density scan", DEXA, which is a low-exposure X-ray test measuring bone density to look for osteoporosis and other diseases where bones lose mass without rebuilding activity. The nuclear medicine technique is sensitive to areas of unusual bone rebuilding activity, since the radiopharmaceutical is taken up by osteoblast cells which build bone. The technique therefore is sensitive to fractures and bone reaction to bone tumors, including metastases. For a bone scan, the patient is injected with a small amount of radioactive material, such as 700–1,100 MBq (19–30 mCi) of 99mTc-medronic acid and then scanned with a gamma camera. Medronic acid is a phosphate derivative which can exchange places with bone phosphate in regions of active bone growth, so anchoring the radioisotope to that specific region. To view small lesions (less than 1 centimetre (0.39 in)) especially in the spine, the SPECT imaging technique may be required, but in the United States most insurance companies require separate authorization for SPECT imaging.
Sources: en.wikipedia.org
On 16 November, Olivey decided that holding the point any longer was pointless and ordered his men to split up, escape by any means possible and re-assemble in Cairo. Over half of the unit reached Egypt.
Adult rats of various strains became obese when they were fed a highly palatable diet for several months. Analysis of their adipose tissue morphology revealed increases in both adipocyte size and number in most depots. Reintroduction of an ordinary chow diet to such animals precipitated a period of weight loss during which only mean adipocyte size returned to normal. Adipocyte number remained at the elevated level achieved during the period of weight gain.
=== Equipment === Commonly used equipment for resistance training include free weights—including dumbbells, barbells, and kettlebells—weight machines, and resistance bands. Resistance can also be generated by inertia in flywheel training instead of by gravity from weights, facilitating variable resistance throughout the range of motion and eccentric overload. Some bodyweight exercises do not require any equipment, and others may be performed with equipment such as suspension trainers or pull-up bars.
== Legacy == Harald Pedersen's engineering contributions helped developing the early Danish insulin industry. He and his brother also established the Novo Foundation in 1951, of which Harald became a life-member of the Board. The Pedersen brothers founded Novo Terapeutisk Laboratorium in 1925 and competed with Nordisk until the 1989 merger that created Novo Nordisk.
==== Transcutaneous lower blepharoplasty ==== In transcutaneous lower blepharoplasty, an incision is made just below the eyelashes. This approach allows for removal or repositioning of orbital fat, excision of excess skin, and modification of the orbicularis oculi muscle when necessary. It is typically used in patients with significant skin laxity.
Sources: en.wikipedia.org
=== Special populations === Diphenhydramine is secreted in breast milk. It is expected that low doses of diphenhydramine taken occasionally will cause no adverse effects in breastfed infants. Large doses and long-term use may affect the baby or reduce breast milk supply, especially when combined with sympathomimetic drugs, such as pseudoephedrine, or before the establishment of lactation. A single bedtime dose after the last feeding of the day may minimize the harmful effects of the medication on the baby and the milk supply. Still, non-sedating antihistamines are preferred. Paradoxical reactions to diphenhydramine have been documented, particularly in children, and it may cause excitation instead of sedation. Topical diphenhydramine is sometimes used, especially for people in hospice. This use is without indication, and topical diphenhydramine should not be used as treatment for nausea because research has not shown that this therapy is more effective than others.
== Current efforts == Current efforts in drug delivery are vast and include topics such as controlled-release formulations, targeted delivery, nanomedicine, drug carriers, 3D printing, and the delivery of biologic drugs.
==== Open wounds ==== Incisions or incised wounds – caused by a clean, sharp-edged object such as a knife, razor, or glass splinter. Lacerations – irregular tear-like wounds caused by some blunt trauma. Lacerations and incisions may appear linear (regular) or stellate (irregular). The term laceration is commonly misused in reference to incisions. Abrasions (grazes) – superficial wounds in which the topmost layer of the skin (the epidermis) is scraped off. Abrasions are often caused by a sliding fall onto a rough surface such as asphalt, tree bark or concrete. Avulsions – injuries in which a body structure is forcibly detached from its normal point of insertion; a type of amputation where the extremity is pulled off rather than cut off. When used in reference to skin avulsions, the term 'degloving' is also sometimes used as a synonym. Puncture wounds – caused by an object puncturing the skin, such as a splinter, nail, knife or sharp tooth. Penetration wounds – caused by an object such as a knife entering and coming out from the skin. Gunshot wounds – caused by a bullet or similar projectile driving into or through the body. There may be two wounds, one at the site of entry and one at the site of exit, generally referred to as a "through-and-through." Critical wounds – Including large burns that have been split. These wounds can cause serious hydroelectrolytic and metabolic alterations including fluid loss, electrolyte imbalances, and increased catabolism.
Central Institute for Research on Buffaloes, Hisar, a publicly funded, institute for water buffalo research. It is located 170 kilometres (110 mi) from Delhi, at Hisar in the north Indian state of Haryana. It has a sub-campus, Bir Dosanjh, at Nabha. CIRB operates a nationwide network of 10 research centres working on breed improvement of the 7 main native breeds. CIRB, with over 20 laboratories for buffalo research, is the world's largest buffalo research institute with the widest range of breeds under study. With the aim of improving breeds and dissemination of information, CIRB has sold over 1,000 bulls, conducted ~200,000 artificial insemination in the field for the farmers' buffaloes with a 41% conception rate, distributed ~520,000 progeny tested frozen semen kits to 45,000 farmers and over 250 institutes, imparted training to several thousand farmers on advanced buffalo husbandry, and created the world's first online Buffalopedia in several languages. It has a large research partner network across India and the globe. It is the second institute to successfully clone a buffalo in 2016, after the first successful cloning was achieved by the National Dairy Research Institute, Karnal in 2010. In July 2017, the Indian Council of Agricultural Research ranked CIRB Hisar as India's number one Buffalo research institute for the year 2016–17. India has 58% the world's buffaloes and 35% of India's cattle are buffaloes. Buffalo milk is 70% of the total milk yield in India, with its national gross domestic product (GDP) share being larger than wheat and rice combined.
On 13 May 1983, two peat workers at Lindow Moss, Andy Mould and Stephen Dooley, noticed an unusual object—about the size of a football—on the elevator taking peat to the shredding machine. They removed the object for closer inspection, joking that it was a dinosaur egg. Once the peat had been removed, their discovery turned out to be a decomposing, incomplete human head with one eye and some hair intact. Forensics identified the skull as belonging to a European woman, probably aged 30–50. Police initially thought the skull was that of Malika Reyn-Bardt, who had disappeared in 1960 and was the subject of an ongoing investigation. While in prison on another charge, her husband, Peter Reyn-Bardt, had boasted that he had killed his wife and buried her in the back garden of their bungalow, which was on the edge of the area of mossland where peat was being dug. The garden had been examined but no body was found. When Reyn-Bardt was confronted with the discovery of the skull from Lindow Moss, he confessed to the murder of his wife. The skull was later radiocarbon dated, revealing it to be nearly 2,000 years old. "Lindow Woman", as it became known, dated from around 210 AD. This emerged shortly before Reyn-Bardt went to trial, but he was convicted on the evidence of his confession.
Sources: en.wikipedia.org
Glutathione is built from three amino acids: glutamate, cysteine, and glycine. The linkage involves the gamma-carboxyl group of glutamate rather than the alpha-carboxyl group, which is unusual for peptides. This structure protects the bond from some common peptidases.
It is present in nearly all cells, with notable amounts in the liver, kidneys, and red blood cells. The highest intracellular concentrations are usually in the millimolar range. Levels differ by tissue, age, and physiological state.
It is not classified as an essential nutrient because cells can synthesize it from amino acids. Dietary sources exist, but their contribution to tissue pools is not fully established. The body's production depends on enzyme activity and precursor availability.
Common approaches include enzymatic recycling assays, HPLC, and LC-MS/MS. Acid extraction and rapid processing limit oxidation before analysis.